I have the ISO image file (that is, *.iso) and I am trying to boot my VirtualBox installation with this image. Is it possible? I know how to mount my ISO image to my filesystem (on my host machine), but I don't think VirtualBox boots an OS from a location on my file system.

I've even tried to mimic mounting, such that VirtualBox thinks it has to boot from the CD drive, but this failed.

What is the correct way to boot an OS from an ISO image in VirtualBox?